.border-1px {
  position: relative;
}
.border-1px::after{
  content: '';
  width: 100%;
  position: absolute;
  left: 0;
  bottom: 0;
  display: block;
  border-top: 1px solid rgba(7,17,27,0.1);
}
@media (min-device-pixel-ratio:1.5){
  .border-1px::after{
    transform: scaleY(0.7)
  }
}
@media (min-device-pixel-ratio:2){
  .border-1px::after{
    transform: scaleY(0.5)
  }
}